Mercury – Tab Extension Harness Assembly | 20-Foot Trim Tab Lead | 84-898059T20

Overview

Longer wiring runs can make trim tab installation tricky, especially on big consoles or wide transoms. The Mercury 84-898059T20 Tab Extension Harness Assembly adds a full twenty feet of reach, giving you plenty of room to route the tab wiring cleanly from the helm to the actuators or control modules. It keeps the rigging neat, avoids overstretching the original harness, and helps the tab system operate smoothly without wiring strain.

Key Features

• 20-Foot Extension – Provides extended reach for trim tab wiring on larger or wide-beam boats.
• OEM Tab Harness – Designed specifically to extend Mercury trim tab system wiring.
• Cleaner Rigging Routes – Offers flexibility for console chases, under-deck paths, and long transom runs.
• Factory Connector Fit – Uses OEM-style ends for a tight, reliable plug-in connection.
• Stable Signal Transfer – Maintains proper trim tab response across the full extension length.
• Marine-Grade Durability – Handles vibration, spray, and long-term movement in rigging spaces.

Compatibility

• Mercury trim tab systems
• Long helm-to-transom wiring runs
• Boats requiring a 20-foot tab harness extension

Performance & Practical Benefits

This harness gives you the slack needed to route trim tab wiring without forcing sharp bends or tight pulls. On larger boats, the extra length helps the wiring stay organized and protected while still delivering smooth, predictable tab movement. It’s flexible enough to run through tight rigging passages and tough enough to handle years of hull vibration and exposure.

Why Buy OEM

OEM harnessing ensures the tab system gets the correct wire gauge, shielding, and connector fit. Mercury’s extension harness prevents the signal issues and loose connections that often happen with aftermarket cable. It installs cleanly, lasts longer, and keeps the tabs responding the way they were engineered to.

FAQ

Q1: When should I use the 20-foot extension?
When the standard tab harness cannot reach the helm or control module due to boat size or layout.

Q2: Will the added length affect tab performance?
No. The OEM harness maintains proper signal integrity over the extended distance.

Q3: Does it install like the factory harness?
Yes. It plugs inline and routes like any standard tab cable.

Q4: Can this harness handle saltwater exposure?
Yes. The jacket and connectors are built for long-term marine environments.

Q5: Does more length help protect the original harness?
Absolutely—it prevents overstretching and allows more natural routing.